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Resummation of non-global QCD observables | M. Dasgupta
; G.P. Salam
; | Date: |
26 Apr 2001 | Journal: | Phys.Lett. B512 (2001) 323-330 | Subject: | hep-ph | Abstract: | We discuss issues related to the resummation of non-global observables in QCD, those that are sensitive to radiation in only a part of phase space. Examples of such observables are certain single-hemisphere event shapes in e+e- and DIS. Compared to global observables (those sensitive to all emissions, e.g. the e+e- thrust) a new class of single-logarithmic terms arises. These have been neglected in recent calculations in the literature. For a whole set of single hemisphere e+e- and DIS event shapes, we analytically evaluate the first such term, at order alpha_s^2, and give numerical results for the resummation of these terms in the large-Nc limit. | Source: | arXiv, hep-ph/0104277 | Services: | Forum | Review | PDF | Favorites |
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